Momoyama

The granitic rocks around Mt. Tsukuba are divided into Tsukuba Granite and Kabasan Granite. At this point, intrusive relationship between these can be observed. In addition, fine-grained diorite (so-called meta-diabase) is also exposed.

Tsukuba Granite in left is intruded by Kabasan Granite in right．

Fine-grained diorite in granitic rocks.